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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Direct reconstruction of dark energy
Physical Review Letters, Volume 104, No. 21, Article 211301, Year 2010
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Description
An important issue in cosmology is reconstructing the effective dark energy equation of state directly from observations. With so few physically motivated models, future dark energy studies cannot only be based on constraining a dark energy parameter space. We present a new nonparametric method which can accurately reconstruct a wide variety of dark energy behavior with no prior assumptions about it. It is simple, quick and relatively accurate, and involves no expensive explorations of parameter space. The technique uses principal component analysis and a combination of information criteria to identify real features in the data, and tailors the fitting functions to pick up trends and smooth over noise. We find that we can constrain a large variety of w(z) models to within 10%-20% at redshifts z 1 using just SNAP-quality data. © 2010 The American Physical Society.
Authors & Co-Authors
Clarkson, Chris A.
South Africa, Cape Town
University of Cape Town
Zunckel, Caroline
United States, Princeton
Princeton University
South Africa, Durban
University of Kwazulu-natal
Statistics
Citations: 62
Authors: 2
Affiliations: 3
Identifiers
Doi:
10.1103/PhysRevLett.104.211301
ISSN:
00319007
e-ISSN:
10797114